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collie_pm.c

/*
 * Based on spitz_pm.c and sharp code.
 *
 * Copyright (C) 2001  SHARP
 * Copyright 2005 Pavel Machek <pavel@suse.cz>
 *
 * Distribute under GPLv2.
 *
 * Li-ion batteries are angry beasts, and they like to explode. This driver is not finished,
 * and sometimes charges them when it should not. If it makes angry lithium to come your way...
 * ...well, you have been warned.
 *
 * Actually, this should be quite safe, it seems sharp leaves charger enabled by default,
 * and my collie did not explode (yet).
 */

#include <linux/module.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/platform_device.h>

#include <asm/irq.h>
#include <asm/mach-types.h>
#include <asm/hardware.h>
#include <asm/hardware/scoop.h>
#include <asm/dma.h>
#include <asm/arch/collie.h>
#include <asm/mach/sharpsl_param.h>
#include <asm/hardware/sharpsl_pm.h>

#include "../drivers/mfd/ucb1x00.h"

static struct ucb1x00 *ucb;
static int ad_revise;

#define ADCtoPower(x)          ((330 * x * 2) / 1024)

static void collie_charger_init(void)
{
      int err;

      if (sharpsl_param.adadj != -1)
            ad_revise = sharpsl_param.adadj;

      /* Register interrupt handler. */
      if ((err = request_irq(COLLIE_IRQ_GPIO_AC_IN, sharpsl_ac_isr, IRQF_DISABLED,
                         "ACIN", sharpsl_ac_isr))) {
            printk("Could not get irq %d.\n", COLLIE_IRQ_GPIO_AC_IN);
            return;
      }
      if ((err = request_irq(COLLIE_IRQ_GPIO_CO, sharpsl_chrg_full_isr, IRQF_DISABLED,
                         "CO", sharpsl_chrg_full_isr))) {
            free_irq(COLLIE_IRQ_GPIO_AC_IN, sharpsl_ac_isr);
            printk("Could not get irq %d.\n", COLLIE_IRQ_GPIO_CO);
            return;
      }

      ucb1x00_io_set_dir(ucb, 0, COLLIE_TC35143_GPIO_MBAT_ON | COLLIE_TC35143_GPIO_TMP_ON |
                             COLLIE_TC35143_GPIO_BBAT_ON);
      return;
}

static void collie_measure_temp(int on)
{
      if (on)
            ucb1x00_io_write(ucb, COLLIE_TC35143_GPIO_TMP_ON, 0);
      else
            ucb1x00_io_write(ucb, 0, COLLIE_TC35143_GPIO_TMP_ON);
}

static void collie_charge(int on)
{
      extern struct platform_device colliescoop_device;

      /* Zaurus seems to contain LTC1731; it should know when to
       * stop charging itself, so setting charge on should be
       * relatively harmless (as long as it is not done too often).
       */
      if (on) {
            set_scoop_gpio(&colliescoop_device.dev, COLLIE_SCP_CHARGE_ON);
      } else {
            reset_scoop_gpio(&colliescoop_device.dev, COLLIE_SCP_CHARGE_ON);
      }
}

static void collie_discharge(int on)
{
}

static void collie_discharge1(int on)
{
}

static void collie_presuspend(void)
{
}

static void collie_postsuspend(void)
{
}

static int collie_should_wakeup(unsigned int resume_on_alarm)
{
      return 0;
}

static unsigned long collie_charger_wakeup(void)
{
      return 0;
}

int collie_read_backup_battery(void)
{
      int voltage;

      ucb1x00_adc_enable(ucb);

      ucb1x00_io_write(ucb, COLLIE_TC35143_GPIO_BBAT_ON, 0);
      voltage = ucb1x00_adc_read(ucb, UCB_ADC_INP_AD1, UCB_SYNC);

      ucb1x00_io_write(ucb, 0, COLLIE_TC35143_GPIO_BBAT_ON);
      ucb1x00_adc_disable(ucb);

      printk("Backup battery = %d(%d)\n", ADCtoPower(voltage), voltage);

      return ADCtoPower(voltage);
}

int collie_read_main_battery(void)
{
      int voltage, voltage_rev, voltage_volts;

      ucb1x00_adc_enable(ucb);
      ucb1x00_io_write(ucb, 0, COLLIE_TC35143_GPIO_BBAT_ON);
      ucb1x00_io_write(ucb, COLLIE_TC35143_GPIO_MBAT_ON, 0);

      mdelay(1);
      voltage = ucb1x00_adc_read(ucb, UCB_ADC_INP_AD1, UCB_SYNC);

      ucb1x00_io_write(ucb, 0, COLLIE_TC35143_GPIO_MBAT_ON);
      ucb1x00_adc_disable(ucb);

      voltage_rev = voltage + ((ad_revise * voltage) / 652);
      voltage_volts = ADCtoPower(voltage_rev);

      printk("Main battery = %d(%d)\n", voltage_volts, voltage);

      if (voltage != -1)
            return voltage_volts;
      else
            return voltage;
}

int collie_read_temp(void)
{
      int voltage;

      /* According to Sharp, temp must be > 973, main battery must be < 465,
         FIXME: sharpsl_pm.c has both conditions negated? FIXME: values
         are way out of range? */

      ucb1x00_adc_enable(ucb);
      ucb1x00_io_write(ucb, COLLIE_TC35143_GPIO_TMP_ON, 0);
      /* >1010 = battery removed, 460 = 22C ?, higer = lower temp ? */
      voltage = ucb1x00_adc_read(ucb, UCB_ADC_INP_AD0, UCB_SYNC);
      ucb1x00_io_write(ucb, 0, COLLIE_TC35143_GPIO_TMP_ON);
      ucb1x00_adc_disable(ucb);

      printk("Battery temp = %d\n", voltage);
      return voltage;
}

static unsigned long read_devdata(int which)
{
      switch (which) {
      case SHARPSL_BATT_VOLT:
            return collie_read_main_battery();
      case SHARPSL_BATT_TEMP:
            return collie_read_temp();
      case SHARPSL_ACIN_VOLT:
            return 500;
      case SHARPSL_STATUS_ACIN: {
            int ret = GPLR & COLLIE_GPIO_AC_IN;
            printk("AC status = %d\n", ret);
            return ret;
      }
      case SHARPSL_STATUS_FATAL: {
            int ret = GPLR & COLLIE_GPIO_MAIN_BAT_LOW;
            printk("Fatal bat = %d\n", ret);
            return ret;
      }
      default:
            return ~0;
      }
}

struct battery_thresh collie_battery_levels_acin[] = {
      { 420, 100},
      { 417,  95},
      { 415,  90},
      { 413,  80},
      { 411,  75},
      { 408,  70},
      { 406,  60},
      { 403,  50},
      { 398,  40},
      { 391,  25},
      {  10,   5},
      {   0,   0},
};

struct battery_thresh collie_battery_levels[] = {
      { 394, 100},
      { 390,  95},
      { 380,  90},
      { 370,  80},
      { 368,  75},      /* From sharp code: battery high with frontlight */
      { 366,  70},      /* 60..90 -- fake values invented by me for testing */
      { 364,  60},
      { 362,  50},
      { 360,  40},
      { 358,  25},      /* From sharp code: battery low with frontlight */
      { 356,   5},      /* From sharp code: battery verylow with frontlight */
      {   0,   0},
};

struct sharpsl_charger_machinfo collie_pm_machinfo = {
      .init             = collie_charger_init,
      .read_devdata       = read_devdata,
      .discharge        = collie_discharge,
      .discharge1       = collie_discharge1,
      .charge           = collie_charge,
      .measure_temp     = collie_measure_temp,
      .presuspend       = collie_presuspend,
      .postsuspend      = collie_postsuspend,
      .charger_wakeup   = collie_charger_wakeup,
      .should_wakeup    = collie_should_wakeup,
      .bat_levels       = 12,
      .bat_levels_noac  = collie_battery_levels,
      .bat_levels_acin  = collie_battery_levels_acin,
      .status_high_acin = 368,
      .status_low_acin  = 358,
      .status_high_noac = 368,
      .status_low_noac  = 358,
      .charge_on_volt     = 350,    /* spitz uses 2.90V, but lets play it safe. */
      .charge_on_temp   = 550,
      .charge_acin_high = 550,      /* collie does not seem to have sensor for this, anyway */
      .charge_acin_low  = 450,      /* ignored, too */
      .fatal_acin_volt  = 356,
      .fatal_noacin_volt = 356,

      .batfull_irq = 1,       /* We do not want periodical charge restarts */
};

static int __init collie_pm_ucb_add(struct ucb1x00_dev *pdev)
{
      sharpsl_pm.machinfo = &collie_pm_machinfo;
      ucb = pdev->ucb;
      return 0;
}

static struct ucb1x00_driver collie_pm_ucb_driver = {
      .add            = collie_pm_ucb_add,
};

static struct platform_device *collie_pm_device;

static int __init collie_pm_init(void)
{
        int ret;

        collie_pm_device = platform_device_alloc("sharpsl-pm", -1);
        if (!collie_pm_device)
                return -ENOMEM;

        collie_pm_device->dev.platform_data = &collie_pm_machinfo;
        ret = platform_device_add(collie_pm_device);

        if (ret)
                platform_device_put(collie_pm_device);

      if (!ret)
            ret = ucb1x00_register_driver(&collie_pm_ucb_driver);

      return ret;
}

static void __exit collie_pm_exit(void)
{
      ucb1x00_unregister_driver(&collie_pm_ucb_driver);
        platform_device_unregister(collie_pm_device);
}

module_init(collie_pm_init);
module_exit(collie_pm_exit);

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